1. A Guide to the Vitamins: Their Role in Health and Disease;Marks,1979
2. McNaughton, J., 1990. Vitamin fortification essential to poultry rations. Feedstuffs, August 27, p. 13.
3. Nutrition of the Chicken;Scott,1982
4. Poultry Management. Modern broiler feeds and strains: What two decades of improvement have done;Sherwood;Feedstuffs,1977
5. The effects of increased levels of niacin supplementation on growth rate and carcass composition of broiler chickens;Waldroup;Poultry Sci.,1985